Sample No.

Basic containing agent

Formaldehyde content (%)

Solids content (%)

Formaldehyde content after 30 days (%)

J1

5% NaOH

1.57

43.3

1.63

J2

10% NaOH

1.40

42.4

1.47

J3

HMTA

1.09

41.8

1.83

J4

25% HMTA

1.34

41.8

1.40

J5

50% HMTA

1.17

43.4

固化